<template>
    <div>
         <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 头部警告区域 -->
            <el-alert title= "注意：只允许为第三季分类设置相关参数" type="warning" :closable="false" show-icon>
            </el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader v-model="selectedCateKeys" :options="catelist" 
                    :props="{ expandTrigger: 'hover', ...cateProps }" @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>

            <!-- tab 页签区域 -->
              <el-tabs v-model="activeName" @tab-click="handleTabClick">

                <!-- 添加动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 --> 
                    <el-button type="primary" size="mini" 
                    :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals"
                                :key="i" closable @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                > </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" 
                                size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"> </el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"> </el-table-column>
                        <el-table-column label="操作"> 
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" 
                                @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini"
                                @click="removeParams(scope.row.attr_id)">删除</el-button>                    
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                 
                <!-- 添加静态属性的面板 --> 
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button type="primary" size="mini"
                    :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals"
                                :key="i" closable @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                > </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" 
                                size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"> </el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"> </el-table-column>
                        <el-table-column label="操作"> 
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" 
                                size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" 
                                size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>                    
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>


        <!-- 添加参数的对话框 -->
        <el-dialog :title=" '添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close='addDialogClosed'>
            <!-- 添加参数对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog :title=" '修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close='editDialogClosed'>
            <!-- 修改参数对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>

    </div>
</template>

<script>
export default {
    data() {
        return {
            //商品分类列表
            catelist: [],
            // 这是级联选择框的配置对象
            cateProps:{
                value: 'cat_id',
                label: 'cat_name',
                childern: 'children'
            },
            // 级联选择器双向绑定到的数组
            selectedCateKeys: [],
            //被激活的页签的名称
            activeName: 'many',
            //动态参数的数据 
            manyTableData:[],
            //静态参数的数据
            onlyTableData:[],
            //控制添加对话框的显示与隐藏
            addDialogVisible: false,
            //添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            //添加表单的验证规则对象
            addFormRules: {
                attr_name: [
                { required:true, message: '请输入参数名称',trigger:'blur'}
                ]
            },
            //控制修改对话框的显示与隐藏
            editDialogVisible: false,
            //修改的表单数据对象
            editForm: {},
            //修改表单的验证规则对象
            editFormRules:{
                attr_name: [
                { required:true, message: '请输入参数名称',trigger:'blur'}
                ]
            },
        }
    },
    created () {
        this.getCateList()
        
    },
    methods: {
        // 获取所有的商品分类列表
        async getCateList() {
            const { data: res} = await this.$http.get('categories')

            if(res.meta.status !== 200) {
                return this.$message.error("获取商品分类失败！");
            }
            this.catelist = res.data

            console.log(this.catelist)
        },
        // 级联选择框选中项变化，会触发这个函数
        async handleChange() {
        // console.log(this.selectedCateKeys)
            this.getParamsData()
        },
       
        // tab 页签点击事件的处理函数
        handleTabClick() {
             console.log(this.activeName)
             this.getParamsData()
         },
        // 获取参数的列表数据
        async getParamsData() {
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3) {
                this.selecetdCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            //证明选中的是三级分类
            console.log(this.selectedCateKeys)
            //根据所选分类的ID，和当前所处的面板，获取对应的参数
            const{data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
            {
                params: { sel: this.activeName }
            })

            if(res.meta.status !== 200) {
                return this.$message.error('获取参数列表失败！')
            }

            
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                //控制文本框的显示与隐藏
                item.inputVisible = false
                //文本框中输入的值
                item.inputValue = ''
            })

            console.log(res.data)
            if (this.activeName === 'many') {
                this.manyTableData = res.data
            }
            else{
                this.onlyTableData = res.data
            }
        },
        //监听添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮，添加参数
        addParams() {
            this.$refs.addFormRef.validate( async valid => {
                if(!valid) return
                const {data: res} = await this.$http.post(
                    `categories/${this.cateId}/attributes`,
                {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })

                if(res.meta.status !== 201) {
                    return this.$message.error('添加参数失败!')
                }

                this.$message.success('添加参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 点击按钮，展示修改的对话框
        async showEditDialog(attr_id) {
            //查询当前参数的信息
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
            { params:{attr_sel: this.activeName }
            })

            if(res.meta.status !== 200) {
                return this.$message.error('获取参数信息失败！')
            }

            this.editForm = res.data
            this.editDialogVisible = true
        },
        //重置修改的表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮，修改参数信息
        editParams() {
            this.$refs.editFormRef.validate(async valid => 
            {
                if (!valid) return
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
                )

                if (res.meta.status !== 200) {
                    return this.$message.error('修改参数失败！')
                }

                this.$message.success('修改参数成功！')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        //根据ID删除对应的参数项
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm(
                '此操作将永久删除该参数, 是否继续?', 
                '提示', 
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        //用户取消了删除操作
        if(confirmResult !== 'confirm'){
            return this.$message.info('已取消删除')
        } 

        //删除的业务逻辑
        const {data: res} = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
        )

        if(res.meta.status !== 200) {
            return this.$message.error('删除参数失败！')
        }

        this.$message.success('删除参数成功！')
        this.getParamsData()
    },
    // 文本框失去焦点 或摁下Enter键都会触发
    async handleInputConfirm(row) {
        // console.log('ok')
        if(row.inputValue.trim().length === 0) {
            row.inputValue = ''
            row.inputVisible = false
            return
        }
        //如果没有return 则证明输入的内容需要后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        //需要发起请求，保存这次操作
        this.saveAttrVals(row)
    },
    // 将对attr_vals的操作 保存到数据库
    async saveAttrVals(row) {
              //需要发起请求，保存这次操作
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
           attr_name: row.attr_name,
           attr_sel: row.attr_sel,
           attr_vals: row.attr_vals.join(' ') 
        })

        if(res.meta.status !== 200) {
            return this.$message.error('修改参数项失败！')
        }

        this.$message.success('修改参数项成功！')   
    },
    // 点击按钮 展示文本输入框
    showInput(row) {
        row.inputVisible = true
        // 让文本框自动获得焦点
        // $nextTick 方法的作用，就是当页面上袁山贝渲染之后，才会执行回调函数中的代码
        this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
        })
    },
    //删除对应的参数可选项
    handleClose(i,row) {
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
    }
},

    computed: {   //计算属性
        //如果按钮需要别禁用，则返回true，否则返回false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        // 当前选中的三级分类的Id
        cateId() {
            if(this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText() {
            if(this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    }
}

</script>

<style lang="less" scoped>
.cat_opt {
    margin: 15px 0;
}

.el-tag {
    margin: 10px;
}

.input-new-tag{
    width: 120px;
}
</style>